Mana burn is something that League PC originally had, but it was removed early on in its life.
I wouldn't expect it to show up in either game, it has a few problems that don't really make it worth having.
1) Like others have pointed out it wouldn't work vs several champions, and while this is fine for some games, it isn't really a space we like things to sit in for Wild Rift.
2) Mana burn is very unfeelable until it feels horrible. Small bits of mana burn is easy to miss and not even know you are being mana burned or burning someone else. But when it does start to matter, if you are the one out of mana, it feels awful, and the only thing you can do is go back to base. While as the one doing the mana burn you might not even really notice.
Basically the feel good, feeling, of mana burning someone isn't nearly as strong as the feels bad, feeling, of being mana burned.
Generally a silence effect, or spell shield, counter, or something else ca...
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